Thyroid Imaging Reporting and Data System (TIRADS) based on 2017 ACR white paper with
guidance on fine needle aspiration (FNA) and follow-up
TR1 B enign: No FNA
TR2 t Suspicious: No FNA
TR3 MiIdly Suspicious: FNA if 2 2.5 cm; Follow-up if 2 1.5 cm at 1,3, and 5 y
TR4 oderately Suspicious: FNA if2 1.5 cm; Follow-up if 2 1 cm at 1,2, 3, and 5 y
TR5 H ighly Suspicious: FNA if 2 1 cm; Follow-up if 2 0.5 cm annually until 5 y